| Accuracy | 
            +/- 1 pulse/sample period | 
        
        
            | Input Impedance | 
            greater than 1.0 M ohm for Vin less than 5V 
            greater than 4.0 K ohm for Vin less than 5V | 
        
        
            | Input Voltage | 
            Low = 0 to 0.5 volts DC 
            High = 4.5 to 24 volts DC | 
        
        
            | Maximum Frequency | 
            100 KHz | 
        
        
            | Min. Pulse Width | 
            50% Duty Cycle: 
            Slow input: 2 milliseconds 
            Fast input: 10 microseconds | 
        
        
            | Range | 
            4095 pulses/sample period | 
        
        
            | Switch Inputs | 
            Input Type: Uncommitted “dry” contacts (relay or switch) 
            Excitation: 5 microamps contact current 
            3.6 volts open circuit 
            Contacts: Sealed gold-plated recommended | 
        
        
            | Warranty | 
            3 – years |